音乐播放器源码

1、本应用主要实现了将手机中的音乐文件添加到显示列表中，可实现音乐的播放、暂停、上一首、下一首的基本功能。

2、代码下载地址：http://download.csdn.net/detail/u011324501/9494884

3、应用布局：main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <ListView        android:id="@+id/listView1"        android:listSelector="#fef"android:drawSelectorOnTop="false"          android:layout_weight="1"        android:layout_width="fill_parent"        android:layout_height="wrap_content">     </ListView>    <LinearLayout        android:layout_width="match_parent"        android:orientation="vertical"        android:layout_height="wrap_content" >        <SeekBar            android:id="@+id/seekBar"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1" />        <RelativeLayout            android:layout_width="fill_parent"            android:layout_height="fill_parent" >            <Button                android:id="@+id/next"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_alignParentRight="true"                android:layout_alignParentTop="true"                android:text="@string/next"                 />            <Button                android:id="@+id/pre"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_alignParentLeft="true"                android:layout_alignParentTop="true"                android:text="@string/pre"                 />            <Button                android:id="@+id/pause"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_alignParentTop="true"                android:layout_marginLeft="16dp"                android:layout_toRightOf="@+id/pre"                />            <Button                android:id="@+id/stop"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_alignParentTop="true"                android:layout_toLeftOf="@+id/next"                android:text="@string/stop"                 />        </RelativeLayout>    </LinearLayout></LinearLayout>

主代码实现：MainActivity.java

package com.example.music;import java.io.File;import java.util.ArrayList;import java.util.LinkedHashMap;import java.util.List;import android.app.Activity;import android.content.Context;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.ListView;import android.widget.SeekBar;import android.widget.AdapterView.OnItemClickListener;import android.widget.SeekBar.OnSeekBarChangeListener;public class MainActivity extends Activity {private MediaPlayer mediaPlayer;private List<String> audioList = new ArrayList<String>();private LinkedHashMap<String, String> map = new LinkedHashMap<String, String>();private int currentItem = 0;private Button pause;private SeekBar seekBar;private Handler hd = new Handler();private Runnable runnable = new Runnable(){@Overridepublic void run() {// TODO Auto-generated method stubint position = mediaPlayer.getCurrentPosition();//当前播播放位置int total = mediaPlayer.getDuration();//int progress = position *100 /total;seekBar.setProgress(progress);hd.postDelayed(this, 200);}};@Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);            mediaPlayer = new MediaPlayer();            Button next = (Button) findViewById(R.id.next);            pause = (Button) findViewById(R.id.pause);            Button pre = (Button) findViewById(R.id.pre);            Button stop = (Button) findViewById(R.id.stop);            /**             * next music             */            mediaPlayer.setOnCompletionListener(new OnCompletionListener() {        @Override    public void onCompletion(MediaPlayer mp) {    nextMusic();    }    });            /**             * stop             */            stop.setOnClickListener(new OnClickListener() {        @Override    public void onClick(View v) {    if(mediaPlayer.isPlaying()){    mediaPlayer.stop();    }    pause.setText("播放");    }    });            //pause            pause.setOnClickListener(new OnClickListener() {        @Override    public void onClick(View v) {    if(mediaPlayer.isPlaying()){    mediaPlayer.pause();    ((Button)v).setText("播放");    }else{    mediaPlayer.start();    ((Button)v).setText("暂停");        }    }    });            //nextMusic            next.setOnClickListener(new OnClickListener() {        @Override    public void onClick(View v) {    nextMusic();    }    });            //preMusic            pre.setOnClickListener(new OnClickListener() {        @Override    public void onClick(View v) {    preMusic();    }    });            /*************************************************************/            //通过getSystemService(Context.AUDIO_SERVICE)方法获得AudioManager实例对象。AudioManager就是我们定义的控制系统声音的对象。            final AudioManager am = (AudioManager) MainActivity.this.getSystemService(Context.AUDIO_SERVICE);            MainActivity.this.setVolumeControlStream(AudioManager.STREAM_MUSIC);            seekBar = (SeekBar) findViewById(R.id.seekBar);            seekBar.setMax(100);//设置最大值为100            seekBar.setProgress(0);//设置初始值为0          //调节手机音量大小 默认音乐可取STREAM_VOICE_CALL（通话）、STREAM_SYSTEM（系统声音）、STREAM_RING（铃声）、STREAM_MUSIC（音乐）、STREAM_ALARM（闹铃声）           // seekBar.setMax(am.getStreamMaxVolume(AudioManager.STREAM_MUSIC));            //final int progress = am.getStreamVolume(AudioManager.STREAM_MUSIC);            //seekBar.setProgress(progress);//进度条设置音量            seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {        @Override    public void onStopTrackingTouch(SeekBar seekBar) {    //拖动滚动条设置当前播放的位置    int musicnow = mediaPlayer.getDuration();//音乐当前播放位置    mediaPlayer.seekTo(seekBar.getProgress() * musicnow/100);    mediaPlayer.start();    }        @Override    public void onStartTrackingTouch(SeekBar seekBar) {        }        @Override    public void onProgressChanged(SeekBar seekBar, int progress,    boolean fromUser) {    hd.removeCallbacks(runnable);//启动线程，实时更新当前播放进度    hd.postDelayed(runnable,1000);       //am.setStreamVolume(AudioManager.STREAM_MUSIC, progress, AudioManager.FLAG_PLAY_SOUND);//    //mediaPlayer.seekTo(seekBar.getProgress());    }    });            /*************************************************************/        }/** * 加载歌曲 */@Overrideprotected void onResume() {// TODO Auto-generated method stubsuper.onResume(); new Thread(new Runnable() {             public void run() {             //audioList();                 // 耗时的方法                 handler.sendEmptyMessage(1);                 // 执行耗时的方法之后发送消给handler             } }).start();  } Handler handler = new Handler() {         public void handleMessage(Message msg) {                         // handler接收到消息后就会执行此方法                 switch (msg.what) {                 case 1:audioList();                         break;                 default:                         break;                 }                 super.handleMessage(msg);         } };  //下一首protected void nextMusic() {    if(++currentItem >= audioList.size()){    currentItem = 0;    }    String path = map.get(audioList.get(currentItem));    playMusic(path);    }//上一首    protected void preMusic() {    if(--currentItem >= 0){    if(currentItem >= audioList.size()){    currentItem = 0;    }    }else{    currentItem = audioList.size() - 1;    }    String path = map.get(audioList.get(currentItem));    playMusic(path);    }    /**     * 加载歌曲     */    private void audioList() {    getFiles("/sdcard/");    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,    android.R.layout.simple_list_item_1,audioList);    ListView listView = (ListView) findViewById(R.id.listView1);    listView.setAdapter(adapter);    listView.setOnItemClickListener(new OnItemClickListener() {    @Override    public void onItemClick(AdapterView<?> viewList, View view,     int position,long id) {    currentItem = position;    String path = map.get(audioList.get(position));    playMusic(path);    }    });    }    //播放音乐    protected void playMusic(String path) {        try {    if(mediaPlayer.isPlaying()){    mediaPlayer.stop();    }    mediaPlayer.reset();//重置    mediaPlayer.setDataSource(path);//指定要播放的音频文件    mediaPlayer.prepare();//预加载音频文件    mediaPlayer.start();    pause.setText("暂停");    pause.setEnabled(true);    hd.removeCallbacks(runnable);//启动线程，实时更新当前播放进度hd.postDelayed(runnable,1000);       } catch (Exception e) {    e.printStackTrace();    }    }    //获取音乐文件路径    private void getFiles(String path) {    File files = new File(path);    File[] file = files.listFiles();    try {    for (File f : file) {    if(f.isDirectory()){    getFiles(f.getAbsolutePath());    }else{    if(f.length()>512)//设置获取音乐文件的大小    if(isAudioFile(f.getPath())){    audioList.add(f.getPath().substring(f.getPath().lastIndexOf("/")+1));    map.put(f.getPath().substring(f.getPath().lastIndexOf("/")+1), f.getPath());    }    }    }    } catch (Exception e) {    e.printStackTrace();    }    }    private static String[] imageFormatSet = new String[]{"mp3"};//设置获取音乐文件的格式    //private static String[] imageFormatSet = new String[]{"ape", "mp3", "wav" };    private boolean isAudioFile(String path) {    for(String format:imageFormatSet){    if(path.contains(format)){    return true;    }    }    return false;        }}

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用到权限：<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

实现的效果图：

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